EP3968086A1 - Parametrisches lichterzeugungsverfahren und dessen anwendung - Google Patents

Parametrisches lichterzeugungsverfahren und dessen anwendung Download PDF

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EP3968086A1
EP3968086A1 EP21194870.8A EP21194870A EP3968086A1 EP 3968086 A1 EP3968086 A1 EP 3968086A1 EP 21194870 A EP21194870 A EP 21194870A EP 3968086 A1 EP3968086 A1 EP 3968086A1
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Prior art keywords
light
frequency
parametric
sum
nonlinear optical
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EP21194870.8A
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English (en)
French (fr)
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Zhengping Wang
Xuezhi Zhao
Fapeng YU
Xun Sun
Xinguang Xu
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Shandong University
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Shandong University
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • G02F1/392—Parametric amplification
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G02F1/3544—Particular phase matching techniques
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • G02F1/395—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves in optical waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0092—Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/37—Non-linear optics for second-harmonic generation
    • G02F1/377—Non-linear optics for second-harmonic generation in an optical waveguide structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the invention is related to a parametric light generation method and its application and belongs to the technical field of laser and nonlinear optics.
  • phase-matching technology was developed soon after the frequency doubling phenomenon was discovered in the 1960s, and it now has developed into the most effective and important nonlinear optical frequency conversion method.
  • the phase-matching technology overall consists of two major categories-sum frequency and difference frequency. Two representative examples of the sum frequency are frequency doubling and cascaded frequency tripling.
  • all the optical parametric frequency conversion processes with phase matching such as optical parametric generation, optical parametric oscillation, and optical parametric amplification, were considered as difference frequencies.
  • the patent document EP3273550A1 has disclosed an optical parametric waveform synthesizer and an optical waveform synthesis method
  • the patent document RU2688860C1 has disclosed a parametric light generator
  • the patent document US20120134377A1 has disclosed a polarization-entangled photon pair generator and its generation method
  • the patent document US6940639B1 has disclosed a phase-matched parametric light generation method in monolithic integrated intersubband optical devices
  • the patent document DE60000851T2 has disclosed a diode laser and the generation of parametric light
  • the patent document RU2099839C1 has disclosed a parametric radiation generating device.
  • the patent document CN109739061A has disclosed a waveguide chip that realizes nonlinear frequency conversion based on the coupled waveguide.
  • the kernel theory of the device is the three-wave and four-wave nonlinear difference frequency processes. It is to produce multiple waveguide regions and utilize the applied electric field to adjust the phase to realize the tuning of the output light by varying the waveguide spacing.
  • the wavelength of the entangled photons can be tuned from 1200 nm to 2300 nm.
  • the patent document CN101895053A has disclosed a cascaded optical parametric conversion system and an optical parametric conversion method.
  • the system consists of cascaded KTP crystals and KTA crystals, with the former used for the type-II phase-matched optical parametric conversion process of the pump light generated by the pumping sources and the latter used for the noncritical phase-matched and the 90° critical phase-matched parametric conversion process of the KTP crystal outputs.
  • This method utilizes the KTP crystals to perform the type-II phase-matched optical parametric conversion process for the pump light generated by the pumping sources and the KTA crystals to perform the noncritical phase-matched or the 90° critical phase-matched parametric conversion process for the outputs of the KTP crystals.
  • the existing technologies have disadvantages as follows: tunable optical parametric frequency conversion is available in the long-wave direction but not in the short-wave direction for the crystals ( ⁇ s ⁇ p ); the frequency conversion of the waveguide and optical fiber can only be carried out in a limited frequency range near the pump light ( ⁇ s ⁇ 2 ⁇ p ), and the tuning of the signal light depends on the tuning of the pump light.
  • the generating mechanism of the parametric light in the invention is as follows:
  • the optical parametric generation process described in the invention follows an energy transfer mechanism as shown in Figure 1.
  • Figure 1 (A) shows the cascade transition process of the one-photon absorption, relaxation, and sum-frequency, which is a ⁇ (1) + ⁇ (2) effect, emits signal light with a frequency in the range of ⁇ p ⁇ s ⁇ 2 ⁇ p , and is referred to as the type-A sum-frequency optical parametric process in the invention.
  • Figure 1 (B) shows the cascade transition process of the two-photon absorption, relaxation, and sum-frequency, which is a ⁇ (3) + ⁇ (2) effect, emits signal light with a frequency in the range of 2 ⁇ p ⁇ s ⁇ 3 ⁇ p , and is referred to as the type-B sum-frequency optical parametric process in the invention.
  • Figure 1 (C) shows the cascade transition process of the three-photon absorption, relaxation, and sum-frequency, which is a ⁇ (5) + ⁇ (2) effect, emits signal light with a frequency in the range of 3 ⁇ p ⁇ s ⁇ 4 ⁇ p , and is referred to as the type-C sum-frequency optical parametric process in the invention.
  • Figure 1 (D) shows another cascade transition process of the three-photon absorption, relaxation, and sum-frequency. Distinguished from the first three effects, the photons of the pump light in this effect do not participate in the final sum frequency process directly. Instead, they will first be relaxed into the two photons of the idle frequency light- ⁇ i1 and ⁇ i2 and generate the photon ⁇ s (2 ⁇ p ⁇ s ⁇ 3 ⁇ ) of the signal light through sum-frequency mixing.
  • the effect in Figure 1 (D) is a ⁇ (3) + ⁇ (1) + ⁇ (2) effect and is referred to as the type-D sum-frequency optical parametric process in the invention.
  • the combination of the second-order nonlinear optical effect and the photon absorption and relaxation effect can generate effective and wide-range tunable sum-frequency parametric light. All methods of generating parametric light through sum frequency based on the above mechanism or similar mechanisms and their related applications are within the protection scope of the invention, no matter how many pump light photons are involved and they are involved directly or indirectly.
  • a parametric light generation method which comprises steps as follows:
  • the sum-frequency phase-matching conditions can be changed continuously by adjusting the space direction, temperature, voltage, or microstructure parameters of the nonlinear optical material to realize the continuous change of ⁇ s and output the tunable sum-frequency parametric light.
  • light waves with wavelengths of ⁇ i and ⁇ s are generated and amplified spontaneously by the nonlinear optical material through parametric scattering or parametric fluorescence, instead of being input from outside.
  • the invention refers to the solution as "sum-frequency optical parametric generation”.
  • light waves with wavelengths of ⁇ i and ⁇ s are generated and amplified spontaneously by the nonlinear optical material through parametric scattering or parametric fluorescence, instead of being input from outside; in the resonant cavity formed by adding cavity mirrors at both ends of the nonlinear optical material, the signal light will make multiple round trips to gain significantly enhanced output.
  • the invention refers to the solution as "sum-frequency optical parametric oscillation".
  • low energy signal light ⁇ s and high energy pump light ⁇ p are provided at the input end, and they will interact with each other on the premises of satisfying the sum-frequency phase-matching conditions to amplify the signal light significantly at the output end at the cost of consuming the pump light.
  • the invention refers to the solution as "sum-frequency optical parametric amplification".
  • the said nonlinear optical material is a bulk crystal with a single structure, a crystal with a periodic structure that can realize quasi-phase matching, an ordinary optical fiber, or a photonic crystal fiber.
  • the said bulk crystal is GdCOB, YCOB, KDP, or BBO.
  • the fluorescence emissions of their characteristic wavebands can be enhanced.
  • the pump threshold of the sum-frequency optical parametric effect can be reduced to boost the output power and output energy of the signal light and improve the conversion efficiency.
  • the pulse laser (for example, the femtosecond-level ultrafast laser) is to be used as the pump light.
  • the pump light is to be focalized or reduced in beams for space shaping to boost its power density and improve the output energy and conversion efficiency of the signal light.
  • the pulse laser such as the ultra-fast laser with pulse width less than 1ps
  • the pump light needs to be focalized or reduced in beams for space shaping to boost its power density and improve the output energy and conversion efficiency of the signal light.
  • the solution “sum-frequency optical parametric oscillation” the existence of the resonant cavity greatly reduces the system's requirement for the power density of the incident pump light, so the pumping source can be in either pulsed operation or continuous operation.
  • the solution “sum-frequency optical parametric oscillation” can also improve the power density of its pump light through focusing or reduction in beams.
  • a parametric light generator which comprises a pump light source and a nonlinear optical medium sequentially arranged along the optical path is also made available.
  • a focusing lens is also provided between the pump light source and the nonlinear optical medium.
  • a color filter is also arranged behind the nonlinear optical medium along the light path.
  • an input mirror of optical parametric oscillation is provided between the focusing lens and the nonlinear optical medium along the light path, and an output mirror of optical parametric oscillation is provided behind the nonlinear optical medium.
  • a signal light source, a signal light reflecting mirror, and a beam combiner for the pump light and the signal light are also provided to enable the signal light generated by the signal light source to enter the focusing lens together with the pump light generated by the pump light source upon the reflecting of the signal light reflecting mirror and the combining of the beam combiner for the pump light and the signal light.
  • the second nonlinear optical medium along the optical path, between the pump light source and the nonlinear optical medium are provided the front mirror and the rear mirror of the beam reduction system, and a color filter is arranged behind the second nonlinear optical medium.
  • the theoretical core of the invention is the sum-frequency, namely the frequency of the signal light equals the sum of the frequency of the pump light and that of the idle frequency light. Therefore, it can achieve frequency up-conversion, and its final output signal light has a higher frequency and a shorter wavelength than the pump light.
  • the sum-frequency generator is simple in construction, easy to operate, flexible to control, and can be tuned to a waveband farther away from the pump light. For example, it can realize a tunable output at the visible waveband of 400 nm to 700 nm when the pump light wavelength is 1550 nm.
  • Pump light source 2. Pump light with a wavelength of ⁇ p , 3. Focusing lens, 4. Non-linear optical medium, 5. Color filter, 6. Signal light with a wavelength of ⁇ s , 7. Input mirror of optical parametric oscillation, 8. Output mirror of optical parametric oscillation, 9. Signal light source, 10. Signal light reflecting mirror, 11. Beam combiner of the pump light and the signal light, 12. Front mirror of the beam reduction system, 13. Rear mirror of the beam reduction system, 14. The first non-linear optical medium, 15. The second non-linear optical medium.
  • the invention presents a parametric light generation method, which comprises steps as follows:
  • Laser light with a wavelength of ⁇ p is injected into the said nonlinear optical material as pump light. Then, the material will output signal light with a wavelength of ⁇ s .
  • the sum-frequency phase-matching conditions can be changed continuously by adjusting the space direction, temperature, voltage, or microstructure parameters of the nonlinear optical material to realize the continuous change of ⁇ s and output the tunable sum-frequency parametric light.
  • different technical routes can be selected depending on the needs, and the corresponding installations also vary.
  • the focusing lens 3 in the above three solutions can be replaced by an optical beam reduction system formed by two convex lenses with different focal lengths to improve the beam quality of the output light and reduce divergence.
  • the installation is as shown in Figure 2 , with all parts arranged along the optical path.
  • the pump light source 1 is an ultrafast laser with a wavelength of 1540 nm, a pulse width of 160 fs, and a repeated frequency of 100 kHz
  • the focusing lens 3 is with a 200 mm focal length
  • the color filter 5 presents a high reflectivity for the wavelength 1540 nm and high transmittance for the waveband 300-800 nm.
  • the test result of the solution is shown in Figure 5 and Figure 6 .
  • the light path of the pump light in the crystal can be continuously changed by rotating the GdCOB crystal to satisfy the different sum-frequency phase-matching conditions, thereby realizing the continuous change of the wavelength ⁇ s of the signal light and the output of the tunable sum-frequency parametric light. Based on the refraction law, the direction of light propagation within the crystal can be calculated from the external rotation angle of the crystal.
  • the ⁇ is fixed as 0°, namely the crystal is rotated in its XZ principal plane only.
  • the test results show that the installation can generate sum-frequency parametric light of 485-770 nm.
  • the theoretical results agree well with the measured values, thus confirming that this effect is a sum-frequency process.
  • this phase matching turns out to be type-I.
  • Figure B shows the relationship between the effective nonlinear optical coefficient deff and the wavelength ⁇ s of the signal light.
  • the d eff increases along with the ⁇ s .
  • the installation is as shown in Figure 7 , with all parts arranged along the optical path.
  • this installation uses an optical beam reduction system formed by two convex lenses with different focal lengths to replace the focusing lens 3.
  • the pump light beam reduction system comprises the front mirror 12 and the rear mirror 13 in replacement of the focusing lens 3 as shown in Figure 2 . Therefore, the incident pump light beam of the crystal has better parallelism.
  • the pump light source 1 is an ultrafast laser with a wavelength of 1540 nm, a pulse width of 160 fs, and a repeated frequency of 100 kHz;
  • the focal lengths of the front mirror 12 and the rear mirror 13 of the beam reduction system are 300 mm and 100 mm respectively, so the beam reduction ratio is 3:1;
  • the test result of the solution is shown in Figure 8 . It shows the signal light spectra obtained in different positions when the GdCOB crystal is rotated. The light path of the pump light in the crystal can be continuously changed by rotating the GdCOB crystal to satisfy the different sum-frequency phase-matching conditions, thereby realizing the continuous change of the wavelength ⁇ s of the signal light and the output of the tunable sum-frequency parametric light.
  • the test results show that the installation can be used to generate sum-frequency parametric light of 490-770 nm.
  • the crystal sample used in the test has good parallelism at the two end faces and can form partial resonant cavity under uncoated conditions, which is conducive to the output of frequency-doubled light in the tangential direction (namely in the frequency doubling direction of 1540 nm), frequency doubling signals with a wavelength of 770 nm are detected, more or less, in each spectrum. If frequency-doubled light is undesirable, the frequency-doubled signals in the tunable output may be eliminated through such technological means as reducing the parallelism of the end faces of the crystal, coating the two end faces with fundamental-frequency antireflective (AR) film, and coating the output end with the frequency-doubled high-reflective (HR) film.
  • AR fundamental-frequency antireflective
  • HR frequency-doubled high-reflective
  • the comparison shows that the pump light beam reduction solution is more beneficial to obtaining light spots with higher beam quality.
  • the installation is as shown in Figure 2 , with all parts arranged along the optical path.
  • the pump light source 1 is an ultrafast laser with a wavelength of 1056 nm, a pulse width of 160 fs, and a repeated frequency of 100 kHz
  • the focusing lens 3 is with a 200 mm focal length
  • the color filter 5 presents a high reflectivity for the wavelength 1064 nm and high transmittance for the waveband 300-800 nm.
  • the test results of the solution are shown in Figure 10 and Figure 11 .
  • the light path of the pump light in the crystal can be continuously changed by rotating the YCOB crystal to satisfy the different sum-frequency phase-matching conditions, thereby realizing the continuous change of the wavelength ⁇ s of the signal light and the output of the tunable sum-frequency parametric light. Based on the refraction law, the direction of light propagation within the crystal can be calculated from the external rotation angle of the crystal.
  • the ⁇ is fixed as 0°, namely the crystal is rotated in its XZ principal plane only.
  • the test results show that the installation can generate sum-frequency parametric light of 450-770 nm.
  • ⁇ p 1540 nm
  • ⁇ s denotes the bottom X-coordinate
  • the corresponding ⁇ i denotes the top X-coordinate
  • the Y-coordinate is the phase-matching angle ⁇
  • a "sum-frequency optical parametric generation" solution with a YCOB crystal pumped by a 1056 nm laser as the non-linear optical medium which follows the mechanism as shown in B and C of Figure 1 .
  • the installation used is similar to that shown in Figure 2 , with all parts arranged along the optical path.
  • the pump light source 1 is an ultrafast laser with a wavelength of 1540 nm, a pulse width of 160 fs, and a repeated frequency of 100 kHz
  • the focusing lens 3 is with a 200 mm focal length
  • the solution uses no color filter 5.
  • the test result of the solution is shown in Figure 12 and Figure 13 .
  • the light path of the pump light in the crystal can be continuously changed by rotating the YCOB crystal to satisfy the different sum-frequency phase-matching conditions, thereby realizing the continuous change of the wavelength ⁇ s of the signal light and the output of the tunable sum-frequency parametric light. Based on the refraction law, the direction of light propagation within the crystal can be calculated from the external rotation angle of the crystal.
  • the ⁇ is fixed as 0°, namely the crystal is rotated in its XZ principal plane only.
  • the test results show that the installation can generate sum-frequency parametric light of 425-528 nm.
  • ⁇ p 1056 nm
  • ⁇ s denotes the bottom X-coordinate
  • the corresponding ⁇ i denotes the top X-coordinate
  • the Y-coordinate is the phase-matching angle ⁇
  • a "sum-frequency optical parametric generation" solution with a KDP crystal pumped by a 1056 nm laser as the non-linear optical medium which follows the mechanism as shown in A, B, and D of Figure 1 .
  • the installation used is similar to that shown in Figure 2 , with all parts arranged along the optical path.
  • the pump light source 1 is an ultrafast laser with a wavelength of 1056 nm, a pulse width of 160 fs, and a repeated frequency of 100 kHz
  • the focusing lens 3 is with a 200 mm focal length
  • the solution uses no color filter 5.
  • the test results of the solution are shown in Figure 14 and Figure 15 .
  • the light path of the pump light in the crystal can be continuously changed by rotating the KDP crystal to satisfy the different sum-frequency phase-matching conditions, thereby realizing the continuous change of the wavelength ⁇ s of the signal light and the output of the tunable sum-frequency parametric light. Based on the refraction law, the direction of light propagation within the crystal can be calculated from the external rotation angle of the crystal.
  • the ⁇ is fixed as 45°.
  • the test results show that the installation can generate sum-frequency parametric light with ⁇ s of 390-670 nm.
  • ⁇ p 1056 nm
  • ⁇ s denotes the bottom X-coordinate
  • the corresponding ⁇ i denotes the top X-coordinate
  • the Y-coordinate is the phase-matching angle ⁇
  • a "sum-frequency optical parametric generation" solution with a BBO crystal pumped by a 1053 nm laser as the non-linear optical medium is similar to that shown in Figure 2 , with all parts arranged along the optical path.
  • the pump light source 1 is a Yb 3+ ultrafast laser with a wavelength of 1053 nm
  • the focusing lens 3 is with a 300 mm focal length
  • the sum-frequency phase-matching angle in the crystal also changes from 62.9° to 28.7°, and the corresponding tunable range of ⁇ is 185-395 nm, covering the entire UV band that can propagate in the air.
  • a tunable light source can meet the various demands for ultraviolet coherent light.
  • the 193 nm light can be used as the ultraviolet light source in the lithography, and the 325 nm light can replace the large-volume and high-noise He-Cd ion laser for medical diagnosis and irradiating treatment, such as checking the five sense organs for cancer and acupoint radiation to treat hypertension and chronic hepatitis, etc.
  • a "sum-frequency optical parametric generation" solution used for the tunable frequency conversion of ultrafast and ultra-intense lasers is similar to that shown in Figure 2 , with all parts arranged along the optical path.
  • the pump light source 1 is an ultrafast and ultra-intense laser with a wavelength of 1053 nm and a peak power between TW and EW.
  • the focusing lens 3 is omitted.
  • the non-linear optical medium 4 is a KDP crystal with a thickness of 10 mm. Its sectional area depends on the diameter of the installation and varies between 100 ⁇ 100 mm 2 and 500 ⁇ 500 mm 2 .
  • the sum-frequency phase-matching angle in the crystal also changes from 51.2° to 41.2°, and the corresponding tunable range of ⁇ s is 318-710 nm, covering the entire visible waveband.
  • Such an installation can be used for laser fusion, studies of ultrarelativistic phenomena, and laboratory astrophysics.
  • a dual-wavelength sum-frequency optical parametric generator used for ultraviolet differential absorption laser radars Its construction is as shown in Figure 16 , with all parts arranged along the optical path.
  • the pump light source 1 is a Yb 3+ ultrafast laser with a wavelength of 1053 nm
  • the focal lengths of the front mirror 12 and the rear mirror 13 of the beam reduction system are 300 mm and 100 mm respectively.
  • this dual-wavelength light source can be used in UV differential absorption laser radars to accurately measure the ozone concentration in the stratosphere.
  • the output wavelengths can be tuned to conduct UV differential absorption measurement for other gases conveniently and flexibly.
  • a dual-wavelength sum-frequency optical parametric generator used for hemoglobin detection of carbon monoxide poisoning Its construction is as shown in Figure 16 , with all parts arranged along the optical path.
  • the pump light source 1 is an ultrafast laser with a wavelength of 1550 nm
  • the focal lengths of the front mirror 12 and the rear mirror 13 of the beam reduction system are 300 mm and 100 mm respectively.
  • this dual-wavelength light source can be used to detect carbonyl hemoglobin, thus determining the extent of carbon monoxide poisoning.
  • the output wavelengths can be tuned to measure the blood content of alcohol and other substances conveniently and flexibly.
  • a dual-wavelength sum-frequency optical parametric generator used to treat intractable port-wine stains Its construction is similar to that in Figure 7 , with all parts arranged along the optical path.
  • the pump light source 1 is a Yb 3+ ultrafast laser with a wavelength of 1053 nm
  • the focal lengths of the front mirror 12 and the rear mirror 13 of the beam reduction system are 300 mm and 100 mm respectively.
  • the color filter 5 is omitted here, so the remaining pump light is output together with the signal light to form a 1053 nm and 595 nm dual-wavelength laser.
  • the 595 nm light can be specifically absorbed by the oxyhemoglobin in blood vessels to form methemoglobin instantly.
  • the methemoglobin can hardly absorb the 595 nm light, but can absorbed the 1053 nm light.
  • Such a synergistic thermal effect can greatly improve the therapeutic effect of the intractable port-wine stains and reduce adverse reactions.
  • the wavelengths of the signal light can be tuned to treat other skin complaints conveniently and flexibly.
  • a sum-frequency optical parametric generator capable of outputting white light. Its construction is as shown in Figure 16 , with all parts arranged along the optical path. Among them, the pump light source 1 is an ultrafast laser with a wavelength of 1550 nm, and the focal lengths of the front mirror 12 and the rear mirror 13 of the beam reduction system are 300 mm and 100 mm respectively.
  • the wavelengths 445 nm and 580 nm can realize white light output by superimposing with each other.
  • the output wavelengths can be tuned to adjust the color temperature of the white light conveniently and flexibly.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
EP21194870.8A 2020-09-15 2021-09-03 Parametrisches lichterzeugungsverfahren und dessen anwendung Pending EP3968086A1 (de)

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CN202010964346.9A CN114185223B (zh) 2020-09-15 2020-09-15 一种参量光的产生方法及应用

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US (1) US11762261B2 (de)
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